Theresa May and Jeremy Corbyn will clash this afternoon (7 September) at Prime Minister's Questions for the first time since the Houses of Parliament returned from their summer recess. The Conservative premier has enjoyed a honeymoon period since succeeding David Cameron after the EU referendum.

But there are signs that May's good fortunes may be coming to an end.

Number 10 was left red-faced yesterday after the eagle eyes and long lens of a political photographer snapped a memo revealing the government's plans for new grammar schools.

The gaffe came just two days after May's grilling on the issue during BBC One's Andrew Marr show. The prime minister dodged his questions, but Labour are now claiming the "cat is out of the bag".

Elsewhere, Brexit Secretary David Davis was slapped down just 24 hours after his House of Commons debut as a cabinet minister.

The Leave campaigner had suggested it was "improbable" for the UK to remain in the single-market because of the government's desire to introduce tougher immigration rules.

But a Downing Street spokeswoman told journalists Davis was sharing his personal view at the despatch box. "All of this is going to have to be negotiated with our European partners, but we should go after the best deal we can," the spokesperson added.

There is plenty of ammunition for the Labour leader heading into the exchange, though Corbyn has missed open goals in the past. Remember when the left-winger failed to mention Iain Duncan Smith's resignation as Work and Pensions Secretary?

Corbyn is, of course, in the middle of a campaign to retain his leadership. His efforts took a bizarre turn yesterday when he held a press conference with Birmingham reggae band UB40. The group endorsed Corbyn as one of his party's best known MPs, Keith Vaz, quit as chair of the Home Affairs Committee.

You can watch the PMQ session live from 12pm BST at BBC Parliament, Sky News and Parliament TV.